Browsing by Author "Erdoǧan Y."

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    Potentiometric titration of some dicarboxylic acids in non-aqueous media
    (1997) Aslan A.; Erdoǧan Y.; Demirbaš A.; Karslioǧlu S.
    Five dicarboxylic acids; adipic acid, azelaic acid, suberic acid, dodecandioic acid and tetradecandioic acid were titrated potentiometrically with tetrabutylammonium hydroxide in five different non-aqueous solvents; tert-butyl alcohol, isopropyl alcohol, acetone, pyridine and N,N-dimethylformamide. The pKa values of the compounds were determined in the solvents mentioned above.
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    Cement mixes containing colemanite from concentrator wastes
    (Elsevier Ltd, 1998) Erdoǧan Y.; Zeybek M.S.; Demirbas A.
    In this article, colemanite ore wastes of particle size <25 mm and sludge from concentrator were dried by hot air flow and then were mixed with Portland and trass cements. The effects on the setting and mechanical properties of the colemanite ore wastes mixed with Portland and trass cements were investigated. It was found that some colemanite wastes can be used as cement additives. © 1998 Elsevier Science Ltd.
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    Influence of colemanite admixture on Portland cement durability
    (2012) Erdogmus E.; Erdoǧan Y.; Gencel O.; Targan S.; Avciata U.
    In this study, the compressive strength of mortar prepared by Portland cement (PC) and different proportions of blast furnace slag, fly ash and colemanite concentrator waste was examined at the end of the 2nd, 7th, 28th, 60th and 90th days. Moreover, some mortars were kept in 50 g/l sodium sulfate (Na 2SO 4) solution according to ASTM C1012 for 6 months to determine their sulfate resistance. The first length of some mortars made with alkali reactive sand together with additives mentioned above or PC according to ASTM C1260 was measured to detect their alkali-aggregate reaction resistance and then their final lengths were measured after being kept in 1 M sodium hydroxide (NaOH) solution at a temperature of 80°C for 14 days. The results were compared both among themselves and with Portland cement. In addition, the microstructures of some samples scanned by scanning electron microscopy were photographed. It was found that all the additives had positive effects on sulfate and ASR resistance. © 2012 Thomas Telford Ltd.
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    Evaluation of Screwing Configurations in Conventional Plating of Femoral Shaft Fractures Using Finite Element Analysis
    (World Scientific, 2021) Öztepe B.; Gök K.; Erdoǧan Y.; Inal S.; Gok A.
    Several fractures that occur in the human body depend on trauma or as a result of hormonal and bone fatigue. Fracture types that take place out of the neck area of the femoral bone are named femoral shaft fractures. Femoral shaft fractures are frequent conditions in orthopedics. Conventional plating method is a method that necessitates the fixation of the contact surface by contacting the epiphyses used in the treatment of such fractures. This method is known to be efficent in speeding up the healing process by reducing the movement between the epiphyses. In this study, femur models which are plated in various forms with fractures were analyzed with computer-aided finite element software and stresses on bone surfaces and fracture surfaces were determined. It is aimed to determine the best result by examining the relationship between the inputs such as the number of screws used during plating, the fixation area and material selection and the outputs obtained by finding the stresses on the bone surface and stresses on the broken surfaces. © 2021 World Scientific Publishing Company.